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Unbreak the kgdb stepping over the special frames on i386 after rev. 1.117 of

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i386/i386/exception.s.

No objections from:	marcel
This commit is contained in:
Konstantin Belousov 2007-03-01 13:56:08 +00:00
parent d7eb5fb599
commit 0a592d0535
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=167143
1 changed files with 22 additions and 1 deletions
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23
gnu/usr.bin/gdb/kgdb/trgt_i386.c
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@ -134,6 +134,8 @@ kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
char dummy_valuep[MAX_REGISTER_SIZE];
struct kgdb_frame_cache *cache;
int ofs, regsz;
static int ofs_fix = 0;
static int ofs_fixed = 0;
regsz = register_size(current_gdbarch, regnum);
@ -145,8 +147,27 @@ kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
*lvalp = not_lval;
*realnump = -1;
if (!ofs_fixed) {
uintptr_t calltrap_addr;
char calltrap[1];
calltrap_addr = kgdb_lookup("calltrap");
if (calltrap_addr != 0) {
if (kvm_read(kvm, calltrap_addr, calltrap,
sizeof(calltrap)) != sizeof(calltrap)) {
warnx("kvm_read: %s", kvm_geterr(kvm));
} else if (calltrap[0] == 0x54) /* push %esp */ {
/*
* To accomodate for rev. 1.117 of
* i386/i386/exception.s
*/
ofs_fix = 4;
}
}
ofs_fixed = 1;
}
ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
? kgdb_trgt_frame_offset[regnum] : -1;
? kgdb_trgt_frame_offset[regnum] + ofs_fix : -1;
if (ofs == -1)
return;